Arctic air to invade majority of US this week

The coldest and most widespread blast of arctic air so far this season will spread across the majority of the United States this week. Frigid air from the depths of the Arctic will plunge into the United States as the jet stream (a fast-river of air along which storms travel) drops southward. The coldest days of next week will yield highs and lows generally 10-20 degrees Fahrenheit below normal from the Northwest to the Gulf and East coasts.
Read more: http://www.accuweather.com/en/weather-news/polar-plunge-to-grip-majority-of-contiguous-us-this-week/70000175?source=Snapzu